I have some issues with Nvidia Settings and can't get what's the problem? I dowgraded my recommended Nvidia driver to older version and everything seems to be fine the resolution and video, so on, I just can't start Nvidia Settings using Terminal, don't know why? Nvidia present at StartUp Applications and whatever... Here's some details from Terminal:

after this I rebooted the system Xorg.conf seems to be present now in /etc/X11/xorg.conf but if I run in Terminal nvidia-settings still says: command not found I also ran gksudo nvidia-settings as a root but after all still says: command not found I've read similar posts to this, but still confused.

Vladdy, thank you for providing us with this information. On AskUbuntu, we prefer the following style: post your comment as an answer, and accept this answer as the solution for your question. You can remove the 'SOLVED' part in the question's title: as soon as you accept your own question, there will be a green dot before your question to show that it is solved.
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Exeleration-GNov 23 '13 at 16:37

ok, got it... only it says I can accept it in 2 days.
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SurferNov 23 '13 at 17:08

Yes, that's something built-in in AskUbuntu. Come back in a couple of days and you'll be able to hit the button.
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Exeleration-GNov 23 '13 at 17:22

1 Answer
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problem SOLVED! thanks anyways to those who checked or tried to reply to this post. The problem was in that I had to reinstall Nvidia Settings as the older Nvidia drivers are not compatible with X server on Ubuntu 12.04 and up. But it's ok now I have what I wanted old good Nvidia-173.14.37 video card works at best.